An UDF programming problem
 

I am an UDF new learner. I am dealing with a 2D, transient, two-phase, cavitation problem. I need to capture the interface between the two phase every iteration. And make the heat flux through a part of the interface constant. The following is my code:
#include "udf.h"
DEFINE_ADJUST(my_adjust,d)
{
Domain *mixture_domain;
cell_t c;
int phase_domain_index=1;
int temp1;
int temp2;
int K;
face_t f;
Thread *mixture_thread;
Thread *subthread=THREAD_SUB_THREAD(mixture_thread,phase_ domain_index);
real xc[ND_ND];
thread_loop_c(c,subthread)
{
C_CENTROID(xc,c,subthread);
if(xc[0]<0.04586)
{
temp=C_T(c,subthread);
K=C_K_L(c,subthread);

C_T_G(c,subthread)[1]=300000000/K;
}
}
}


The code has been interpreted. But FLUENT cannot go on the calculation. Please help me correct the code. Thank you very much!!!

Did you try compiling the code instead of interpret?

The fluent manual suggest that UDF with DEFINE_ADJUST works only after compiling.

Hi
I will try to help a little bit.
First, mixture thread is the thread you should use for your loop. The THREAD_SUB_THREAD have to be inside this looping operation. In this case you give subthread a phase-level thread of a mixture thread which isn't defined.
Second, I'm not 100% sure about this, but I think it isn't possible to set a temperature gradient, because it is a derived value in your flow field.
At least your looping macro uses the wrong input and you have to loop over the cells in every thread, too. (Domain->Loop Thread-> Loop Cells -> Cell Operations). Check out the UDF Manual about this.
However good luck with your solution.
Greetings